Question

3)9,8*3/10 4)7,2:1/100​

Answer 1

3) 9,8 · 3/10 = а) 2,94; б) 2 целых 47/50

а) 3/10 = 0,3

9,8 · 0,3 = 2,94

б) 9,8 = 98/10 = 49/5

49/5 · 3/10 = 147/50 = 2 целых 47/50

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4) 7,2 : 1/100 = 720

а) 1/100 = 0,01

7,2 : 0,01 = 720

б) 7,2 = 72/10 = 36/5

36/5 : 1/100 = 36/5 · 100/1 = 36 · 20 = 720

Answer 2

To solve the given expressions:

3. $9.8 \times \frac{3}{10}$ First, we multiply 9.8 by 3, which gives us 29.4. Then, we divide 29.4 by 10, which results in 2.94.

Therefore, $9.8 \times \frac{3}{10} = 2.94$.

4. $7.2 : \frac{1}{100}$ Dividing by a fraction is equivalent to multiplying by its reciprocal. The reciprocal of $\frac{1}{100}$ is 100, so we can rewrite the expression as $7.2 \times 100$. Multiplying 7.2 by 100 gives us 720.

Therefore, $7.2 : \frac{1}{100} = 720$.